The Diamond back is an All-Terrain Attack Vehicle (ATAV) with multiple configurations depending on the scenario. It has a single driver, the Baroness in this case, who can control all weapon systems from inside the vehicle.
To the left you see the dual 6 pack missile launcher. On the other side, is a heavy machine gun which can is usually operated by a gunner (rather than the driver), in this case a Crimson Guardsmen.

Here is the missile launcher that slides into the back compartment of the Diamondback. It rotates 360 and the missile pods can elevate independently. It can be armed with anti-tank or SAMs or a mixture of both.

Here we see a close up of the machine gun pod, which stores ammo below. There is a small support behind the gunner to add stability and a shield mounted on the gun for protection. It also rotates and elevates.

Here you can see it without a weapons package in the back. In this variation, you could carry a couple of troops or supplies... or put a couple big-@$$ subwoofers and amps and crank tha bass (not really).

Finally, I need to give most of the credit to Louis K because it is based heavily on his Alien Defender. I reworked the doors, back, under the hood and the front grill a little bit, but the back body is his.
You can see his awesome (inspiring) work here: http://www.mocpages.com/moc.php/272733
Go there and show him some love.

Alright, Just Making Sure, But If You Ever Want The Older Versions, I Have Them So Just Ask. Oh, I Might As Well Let You Know About This, That's A Link To Download A File I Made, It Has All The Colors From 4.0.2, That's 141 Colors In Total, If You Want More Coloring Options.

Hey, Since I Remade My Account, I Failed To See This Message Until Now.
http://www.mocpages.com/group_conversation.php?id=1522&topicid=11618#comment-765898
Sorry For The Late Response, If You Still Want The Older Versions, I Have 3.1.3 And 4.0.2, Anything Beyond 0.2 Is The Newer LDD Similar To The Newest Version. I Can Also Show You How To Unlock The Universe Mode For The Older Version And The Extended Mode For Later Versions. Just Email Me At humpfreerates@gmail.com If You Want The Files And The Instructions. You're On A Mac Still, Or No?

Thanks but I updated my LDD and have all the parts again. The groupings of parts are a little wonky but manageable.

Quoting Andrew AKA Hump-Free
Hey, Since I Remade My Account, I Failed To See This Message Until Now.
http://www.mocpages.com/group_conversation.php?id=1522&topicid=11618#comment-765898
Sorry For The Late Response, If You Still Want The Older Versions, I Have 3.1.3 And 4.0.2, Anything Beyond 0.2 Is The Newer LDD Similar To The Newest Version. I Can Also Show You How To Unlock The Universe Mode For The Older Version And The Extended Mode For Later Versions. Just Email Me At humpfreerates@gmail.com If You Want The Files And The Instructions. You're On A Mac Still, Or No?

One of the best LDD creations I've seen. It does look slightly reminiscent of the Warthog from Halo, but it also has its own unique shape. Great build, I would totally buy it if it was sold on the market.

Quoting Henry Landivar
i agree this is awesome.LDD is fun to use but too expensive. if you dont believe me go to LDD put one stud and nothing else and look at the price

If you search my MOCs you will see the Razorback. I did it in LDD first and then bought all the bricks via BrickLink, not LEGO. It can be expensive, but you get what you want. For me, it is more expensive than it would be for most people because I live in Hong Kong and bricks are more limited and expensive there.